A low level traverses from the back of the cave out onto the front face. From the start of Sorceress move left onto a ledge. Here, hard moves (crux) lead round the corner and onto a slab. Move down the slab and continue heading out to the lip via a series of undercuts to move round onto the initial wall of Sorcerer. Rest. Finish as for High Traverse. Top out for the full tick.
This description isn't Dark Magic - Dark Magic is essentially a counter line to Enchantress, starting just to the right and going diagonally up and left via an undercut flake and then a fingercrack to eventually join the very top of Magician. I don't know of a name for the 7B traverse. i_a_coops - 2013